Precipitation strengthening in Al (Sc,Ti) alloys

被引：0
作者：
van Dalen, ME [1 ]
Dunand, DC [1 ]
Seidman, DN [1 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
来源：
AFFORDABLE METAL MATRIX COMPOSITES FOR HIGH-PERFORMANCE APPLICATIONS II | 2003年
关键词：
Al-Sc-Ti alloys; precipitation hardening; microstructure; three-dimensional atom-probe microscopy;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Three-dimensional atom probe (3DAP) and field-ion microscopies, together with microhardness measurements, are employed to analyze Al-3(SC1-xTix) precipitates in an Al-0.06at%Sc-0.06at.%Ti alloy aged at 300degreesC for different times. The field-ion microscope images show a relatively high number density of precipitates (estimated at (3+/-2)x10(21)ppt m(-3)) at the aging times analyzed. Concentration profiles obtained with 3DAP microscopy show that both Sc and Ti partition to these precipitates. While most of the Sc is contained in the precipitates, the Ti resides mainly in the matrix in solid solution. Consequently, the addition of Ti increases the hardness of this alloy only modestly over that of binary Al-Sc alloys. Additionally, the coherent Al-3(SC1-xTix) precipitates remain stable and coarsening-resistant up to aging times of at least 240 hr. at 300degreesC.
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页码：195 / 201
页数：7
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